#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
	int a = 30;//00011110
	int b = 20;//00010100
	a = a^ b;  //00001010
	b = a^ b;  //00011110
	a = a^ b;  //00010100
	printf("%d %d", a, b);
	return 0;
}